crossing over


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crossing over

 
the exchanging of material between homologous chromosomes, during the first meiotic division, resulting in new combinations of genes.

crossing over

or

crossing-over

(krô′sĭng-ō′vər, krŏs′ĭng-)
n.
The exchange of genetic material between homologous chromosomes that occurs during meiosis and contributes to genetic variability.

crossing over

Recombination Vox populi A popular phrase for a change in a person's sexual preference, usually heterosexual → homosexual
Crossing overclick for a larger image
Fig. 123 Crossing over . The exchange of chromatid material.

crossing over

a process occurring in the DIPLOTENE stage of Prophase 1 of MEIOSIS in which there is exchange of nonsister CHROMATIDS, producing genetic RECOMBINATION. (see Fig. 123 ). See also UNEQUAL CROSSING OVER.